His catchphrases are "Geweldig" (magnificent) or just plain "Wow". He also has a history of going on TV shows absolutely clueless to just about anything. There's lots of gold to be had but someone needs to provide english translations for that. He once had a personal youtube channel where he would just point a camera to his face and just say whatever Wally stuff came to his mind. Of course this caused a lot of mockerey and was quickly deleted, but people saved all the vids anyway. One of the memorable things was that he kept pronouncing youtube as "tsjooptsjoop"

^he tries to talk english at 1:54

And now... I don't know what happened, how it happened or where it came from, but for some reason he made a "Wow" greenscreen and it ended up on youtube. And now he is part of internet memes.... He finally got the international attention he deserved (despite claiming he is famous in China...)